Forty-six-year-old Tricia McCauley's body was found inside her car, tied up and wedged between the front and rear seats, according to court papers. Police say she had been sexually assaulted, strangled and beaten to death.

According to the Post, Duane Adrian Johnson, 30, faces 30 years in prison when he is sentenced in November. Police reportedly believe Johnson confronted McCauley on her way to a Christmas party hosted by friends in Washington's theater community. They reportedly do not believe the two knew each other prior to the encounter.

McCauley was reported missing after she didn't show up to the party. Ann Norton, the executive director of the Washington Stage Guild, said there was evidence that McCauley had left her apartment with the Brussels sprouts she planned to bring to the dinner.

Johnson, whose criminal history includes multiple theft charges, had been ordered to wear a GPS monitor in the days before the slaying, and a judge had requested a mental health evaluation, court records show. According to CBS affiliate WUSA, he did not show up to be fitted with the device.